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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

26502 results found.

  1. Trigger 324561: IGR J08408-4503 detected by Swift
  2. GRB 080919: Swift-XRT refined analysis
  3. GRB 080919, Swift-BAT refined analysis
  4. GRB 080916C: IRSF/SIRUS NIR Observation
  5. GRB 080916C: GROND Confirmation of the Optical Afterglow
  6. GRB 080916C: GROND Confirmation of the Optical Afterglow
  7. GRB 080919: REM NIR observations
  8. GRB 080919: Swift detection of a short burst
  9. GRB 080915A: GROND upper limits
  10. GRB 080916A: GROND lightcurve
  11. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  12. GRB 080916A: Fermi GBM detection
  13. GRB 080916C: Swift UVOT Refined Analysis
  14. GRB 080916C: Swift XRT refined analysis
  15. GRB 080916B: Swift-XRT refined analysis
  16. Konus-Wind observation of GRB 080916A
  17. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  18. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  19. GRB 080916C: Enhanced XRT position
  20. GRB080916A: Spectroscopic redshift
  21. GRB 080916C: Swift/XRT detection of possible afterglow
  22. GRB 080916B: Swift UVOT Refined Analysis
  23. GRB 080916B, Swift-BAT refined analysis
  24. GRB080916A: Refined Swift/UVOT Observations
  25. GRB 080915a, SMARTS optical/IR observations
  26. GRB 080916B: Enhanced Swift-XRT position
  27. GRB 080916C: Fermi LAT observation
  28. GRB 080916C: Fermi GBM Detection
  29. GRB 080916A: Swift XRT refined analysis
  30. GRB 080916A, Swift-BAT refined analysis
  31. GRB 080916B: Swift-XRT afterglow detection
  32. GRB 080916A: Enhanced Swift-XRT position
  33. GRB 080916: REM detection of the NIR afterglow
  34. GRB 080916: REM candidate afterglow
  35. GRB 080916: Swift detection of a burst with optical afterglow
  36. GRB 080915B, Swift-BAT refined analysis
  37. GRB 080912 : Fermi GBM detection
  38. GRB 080915: REM NIR early observations
  39. GRB 080915: Swift/UVOT Upper Limits
  40. GRB 080915: Swift-XRT afterglow detection and analysis
  41. GRB 080915, Swift-BAT refined analysis
  42. GRB 080915: ROTSE-III Optical Limits
  43. GRB 080913: Swift-XRT refined analysis
  44. GRB080913: Swift/UVOT Upper Limits
  45. GRB 080913, Swift-BAT refined analysis
  46. GRB 080913: VLT/FORS2 observations
  47. GRB 080913: REM NIR early observations
  48. GRB 080913: Enhanced Swift-XRT position
  49. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  50. GRB 080913: Swift detection of a burst
  51. GRB 080906: Watcher observations
  52. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  53. GRB 080906B: Fermi GBM detection
  54. GRB 080905C: Fermi GBM detection
  55. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  56. Swift trigger 324362 (LS I +61 303 ?)
  57. GRB080905A: Swift/UVOT Upper Limits
  58. GRB 080905B: Watcher optical detection
  59. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  60. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  61. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  62. GRB 080905A: MITSuME Akeno optical upper limits
  63. GRB 080906: Refined Swift/UVOT Observations
  64. GRB 080906: Swift-XRT Refined Analysis
  65. GRB 080906, Swift-BAT refined analysis
  66. GRB 080905A: optical afterglow
  67. GRB 080906: GROND observations of the optical/NIR afterglow
  68. GRB 080905B: Refined UVOT Analysis
  69. GRB 080905B: VLT redshift
  70. GRB 080905A: NOT and VLT observations
  71. GRB 080905B: Enhanced Swift-XRT position
  72. GRB 080905B, Swift-BAT refined analysis
  73. GRB 080905A, Swift-BAT refined analysis
  74. GRB 080906: Swift detection of a burst with optical afterglow
  75. GRB 080905A: Swift-XRT Refined Analysis
  76. GRB080825C: Fermi-LAT observations
  77. GRB 080905B: Swift detection of a burst with possible optical counterpart
  78. GRB 080905: Swift detection of a probably-short burst
  79. GRB 080903: Swift/UVOT Observations
  80. GRB 080903: Swift-XRT Refined Analysis
  81. GRB 080903: Enhanced Swift-XRT position
  82. GRB 080903, Swift-BAT refined analysis
  83. GRB 080903: optical observations
  84. GRB 080903: Liverpool Telescope observations
  85. GRB 080903: Optical afterglow candidate
  86. GRB 080903: TAROT Calern observatory optical observations
  87. GRB 080903: Swift detection of a burst
  88. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  89. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  90. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  91. nIR observations of SGR 0501+4516
  92. SGR 0501+4516: Confirmation of the NIR counterpart
  93. GRB080828: Swift/UVOT Upper Limits
  94. SGR 0501+4516: Detection of possible optical counterpart
  95. GRB080825B: Swift/UVOT Upper Limits
  96. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  97. VLA non-detection of SGR 0501+4516
  98. Swift trigger 322590: BAT detection of a possible burst
  99. GRB 080828: SuperAGILE GRB Localization
  100. Enhanced Swift-XRT position of SGR 0501+4516

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